I forgot to mention, that I'm talking about a Tk script and let's forget about packaging using PerlApp, which was just clouding the issue. The script itself does not make use of any inside '-font' declaration at all. Perl is called
perl <script-name> -font "<choosen font>"
And as I mentioned, this works fine with any choosen font under Windows ActivePerl as well as under the 'native' Linux-supplied Perl. The problem is in the Linux ActivePerl distribution. Whatever font I choose, it looks ugly. Is there any additional 'use' or an environment variable required?
Again sorry, to waste your valuable time.
Best regards - jowe